1) An awkward drinking posture, manner and style; an attempt to avoid consuming an alcoholic beverage

2) Utilizing an awkward posture or style to avoid consuming alcohol, when you call someone out on doing a Bruce sip, you are calling them unmanly and unaccustomed to consuming strong beverages

3) Apathetic beverage ritual, the “Bruce sip”; consuming an alcoholic beverage by rotating one's head backwards simultaneously rotating the glass forward- keeping the top of the glass perpendicular to the floor

“You bruce sip that again and I'm going to take that drink away from you and give it to my daughter!”

“I don’t mean to lame out, but that shot was so strong I Bruce sipped it”.